Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

I ordered a sct 4 banks chip from Don at lasota racing about a month ago, and after the install the car is hard starting when cold and recently will not keep running at traffic lights. Are these problems coming from this chip? I already had to send one chip back to Don because the car wouldn't run at all with it. When I take the chip out the car runs great around town. I got my pro-m maf today hopefully switching the summit brand for this will do something. If not, what do I do?

Make the tuner make the chip right. If the car runs with it out better than with it in, then that is a chip problem. Considering that absolutely anything can be adjusted via a tune, there is no reason at all for it to run WORSE once you have it tuned.

That being said, have you talked to the tuner yet? Most people that use that shop are happy with the results. I am guessing you will end up the same way if you call them up and explain what is happening.

That being said, if you just had it tuned, then why on Earth would you start throwing new parts on it already? If you want the Pro-M MAF, that is fine. It is a good product. I am guessing that, chip out and Pro-M in, the car will ruin better than with the Summit MAF.

But, if you call up the shop and say "hey, my car isn't running so great since I put your chip in, and, by the way, I changed the MAF" then all you have done in their mind is introduce a variable into the equation that could account for the car not running right. After all, they have no way of knowing, for sure, that the car didn't run great UNTIL you changed the MAF, right? If they have to consider this possibility as well, I don't think that is a very fair thing for you to ask of them. Not saying you would lie about it or anything, so I don't want you to think that is what I am implying. I am just saying that they will certainly have to consider the MAF as a possible source, because they just do not know for sure.

So, my advice - give the tuner a chance. They will more than likely resolve your issue and make you happy. But, if you want it re-tuned for the new MAF, then I wouldn't expect that to be done for free. That is just my opinion though.

I understand what your saying completely.But The tune was a mail order tune and they have never actually seen or put the car on a dyno before. Both the MAF meters are calibrated for the same size injectors and cold air, Would that still be a bad idea to try? I was going to put the stock coil back in and try this better MAF just because I know those guys have a good reputation and that they don't burn junk chips. I just dont want to wait another 2 weeks if its something easy

I understand what your saying completely.But The tune was a mail order tune and they have never actually seen or put the car on a dyno before. Both the MAF meters are calibrated for the same size injectors and cold air, Would that still be a bad idea to try? I was going to put the stock coil back in and try this better MAF just because I know those guys have a good reputation and that they don't burn junk chips. I just dont want to wait another 2 weeks if its something easy

Every car is different so it is difficult to get a mail order tune that is perfect and one that will make your car run great. Have you considered saving up for a dyno tune? That would be your best bet for a modded car, which you seem to have, if you want it to run well and for the best performance gains.

If so, I think your problems sound like an issue with the MAF. Could be you have a bad MAF, or could be the transfer function in the tune is incorrect. Who knows? Not me, since I am not a tuner

But, it definitely sounds like a combination of the MAF and the tune. Have you tried the Pro-M without the chip yet (since you said you had it)?

I replaced the msd coil for a new 18$ napa ignition coil and also installed my new pro-m maf and the car runs 100 times better. No more stalling or hard starting, better throttle response and even better gas mileage. I do have the trickflow stage 1 and thats why I was so dissapointed that after the tune the car wouldnt run correctly even know thats a semi-computer friendly cam. Summit Racing is even going to let me return the MAF for a full refund and its been 3 months since I purchased it. SO hopefully this solves my problems. Thanks for the input